How to Use the Add Watermark to PDF Online
- Upload your PDF file.
- Type your watermark text (e.g., CONFIDENTIAL, DRAFT).
- Set opacity, font size, and rotation angle.
- Click "Apply Watermark" and download the watermarked PDF.
Key Features & Capabilities
- Customizable text opacity, font size, and 45-degree angle.
- Stamps across all pages uniformly.
- 100% client-side privacy.
Technical Architecture & Privacy
Add Watermark to PDF Online is engineered with a focus on performance, mathematical accuracy, and maximum user privacy. Operating entirely in-browser on the client side, all processing takes place locally within your browser's JavaScript engine. None of your financial numbers, text entries, or private inputs are ever transmitted to or stored on remote servers.